电流控制模式白光LED驱动电路的频率补偿研究  

A Study on Frequency Compensation of Current Mode White LED Driver

作　　者：陶平[1] 易扬波[1] 吴建辉[1] 

机构地区：[1]东南大学国家ASIC系统工程研究中心,江苏南京210096

出　　处：《现代电子技术》2005年第18期106-108,共3页Modern Electronics Technique

摘　　要：白光LED由于其工作寿命长和能耗低的特点,为无线通讯产品的应用提供了完美的背光方案,其驱动芯片的设计大部分采用电压模式和电流模式两类控制方案。电流控制型白光LED驱动电路因为线性调整率和负载调整率非常好的优点成为目前设计的热点。基于1MHz开关频率的电流控制型白光LED驱动芯片,结合相关的研究,对电流控制型白光LED驱动芯片进行了小信号分析,根据得出的回路增益提出了具体的频率补偿方案,并给出了实现频率补偿的方案必须满足的参数设计方法。补偿方案能有效提高白光LED驱动芯片的小信号稳定性。Because of the advantages of long life for use and low power dissipation, white LED provides a perfect backlight method. Most of white LED drivers consist of either current controlling mode or voltage controlling mode. Current controlling mode white LED driver is hotspot because of its good line regulation and load regulation. Based on 1 MHz current controlling mode white LED driver ,combining with the new achievements of relevant research ,the small signal analysis of the current controlling mode white LED driver has been analyzed in the paper. Based on the loop gain,the concrete frequency compensation method and parameter design method to meet the need for the compensation have been given. The scheme has been proved useful by the simulation.

关 键 词：频率补偿 白光LED驱动电路 右零点 

分 类 号：TN432[电子电信—微电子学与固体电子学]